update client to use channel rather than socket

pkg/analysis_server/test/protocol_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library test.protocol;
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:unittest/matcher.dart';
 import 'package:unittest/unittest.dart';
 
 main() {
   group('Request', () {
     test('getParameter_defined', RequestTest.getParameter_defined);
     test('getParameter_undefined', RequestTest.getParameter_undefined);
     test('getRequiredParameter_defined', RequestTest.getRequiredParameter_defined);
     test('getRequiredParameter_undefined', RequestTest.getRequiredParameter_undefined);
+    test('toJson', RequestTest.toJson);
   });
   group('Response', () {
     test('create_contextDoesNotExist', ResponseTest.create_contextDoesNotExist);
     test('create_invalidRequestFormat', ResponseTest.create_invalidRequestFormat);
     test('create_missingRequiredParameter', ResponseTest.create_missingRequiredParameter);
     test('create_unknownRequest', ResponseTest.create_unknownRequest);
     test('setResult', ResponseTest.setResult);
   });
 }
 
@@ skipping 18 matching lines @@
     Request request = new Request('0', '');
     request.setParameter(name, value);
     expect(request.getRequiredParameter(name), equals(value));
   }
 
   static void getRequiredParameter_undefined() {
     String name = 'name';
     Request request = new Request('0', '');
     expect(() => request.getRequiredParameter(name), throwsA(new isInstanceOf<RequestFailure>()));
   }
+
+  static void toJson() {
+    Request original = new Request('one', 'aMethod');
+    expect(original.toJson(), equals({
+      Request.ID: 'one',
+      Request.METHOD : 'aMethod'
+    }));
+  }
 }
 
 class ResponseTest {
   static void create_contextDoesNotExist() {
     Response response = new Response.contextDoesNotExist(new Request('0', ''));
     expect(response.id, equals('0'));
     expect(response.error, isNotNull);
     expect(response.toJson(), equals({
       Response.ID: '0',
       Response.ERROR: {'code': -1, 'message': 'Context does not exist'}
@@ skipping 37 matching lines @@
     response.setResult(resultName, resultValue);
     expect(response.toJson(), equals({
       Response.ID: '0',
       Response.ERROR: null,
       Response.RESULT: {
         resultName: resultValue
       }
     }));
   }
 }